Holosun 403R review


The absence of parallax is among the features, that shooters look out for when going through the specs of an optical sight. A parallax-free optical sight means that the sight will remain locked on the target even when you have to move your head or when your body is not comfortably positioned.

The Holosun 403r is among the pioneer units that have incorporated the rheostat dial controls used for the adjustment of the brightness settings. However, there is concern among enthusiasts of the units parallax, most retailers are purporting that the unit is parallax free, while a few users seem to experience horizontal parallax when using the sight at about 30 yards.

Most Holosun devices are known to be parallax free after 25 yards, well if you have used different brands of the optical sights, you will notice that they do have some parallax. So, to even things out a bit is that if you are ever in a position where the amount of parallax is of little importance then why not mount the sight and shoot.

In essence, there is no unit that is 100% effective even the pricey MRO’s have been established to have some parallax, so if other features of the sight work exceptionally well, you could always find a way of dealing with the parallax. Besides, when using the scopes, parallax is never a concern if you are engaging targets at a distance of 250 yards or less.

But to be on the safe side as regards your optical sights parallax you could get a unit with parallax adjustments given that it is an important aiming aid, when taking a shot. The importance of an adjustable parallax is that the distance of the image of the objective lens is moved until you are provided with a clear target image.

Holosun 403R review and breakdown

This red dot sight is equipped with an advanced LED technology which is among the latest advanced technologies today. This is because it allows you to have a clear view every time you lock on a target. In addition to this, it also helps the red dot sight save on battery even when you are using it on the brightest settings throughout.

The Holosun 403r review is also very user- friendly as it comes with very few adjustment controls that are easy to use and don’t require any expertise. For example, all you have to do to increase or decrease the brightness settings is by simply turning the Rheostat dial. This dial also operates efficiently throughout even if you constantly adjust the brightness settings.

One of the best features that come with the Holosun 403r red dot sight is definitely its MOA red dot reticle. It is always visible regardless of the time of the day which enables you to have an accurate aim every time you use it on your gun. Its reticle has 10 daylight and 2 night vision levels which enables it to be visible whenever you use it. In addition to this, the Holosun 403r has an IP67 rating which means that it is also waterproof.

What we liked;

  • It is very lightweight.
  • It is waterproof.
  • It comes with a long battery life.
  • It is made of durable material.

What we didn’t like;

  • Flashback of the red dot is not good in some light conditions.

Holosun 403R specifications

Red dot sight
2.75 x 1.43 x 1.62 inches
3.53 oz
Battery life
100,000 hours
Water resistance
IP67 waterproof
Objective lens diameter

Holosun 403R features

Design and Structure

The Holosun 403r red dot is made of aluminum which is strong and very durable. For sure, it won’t break easily even when it falls down a number of times which is very good for a red dot sight. This is because it will serve you for quite some time without needing replacement. Aside from this, it also measures 2.75 x 1.43 x 1.62 inches and weighs 3.53 oz. Its lightweight allows you to attach it to your gun without adding any significant weight.

This red dot sight is equipped with a multi-coated optical lens which prevents it from getting scratches easily. In addition to this, it also allows water to slide off easily in the event you use it in rainy conditions. For sure this ensures that you have a clear view of your target at all times.


It comes with brightness settings of up to 10 and an objective lens diameter of 20mm. This width allows you to have a precise view of any target and maximizes on your accuracy. In addition to this, the brightness settings give you flexibility as you can easily adjust the brightness to suit your preference. All you have to do is simply turn the Rheostat dial until you get the brightness level that suits you best.

Basically, the Holosun 403R red dot sight guarantees you an accurate view of your target throughout which is key especially if you are a sharpshooter.


The Holosun 403R red dot sight comes with a magnification power of up to 1x. Well, this may not be the most powerful magnification power as other scopes such as the 3x and 6x are much powerful. However, the 1x red dot sight is still good enough and will allow you to deal with close targets effectively. This is because it allows you to magnify your target by 100 percent which allows you to have great precision whenever you lock your target.

Battery life

This is actually one of the most important features that we consider when looking at red dot sights. Without doubt, the Holosun 403r doesn’t disappoint when it comes to battery life as it is equipped with a CR2032 that can last you up to 100,000 hours. Yes, that’s right! Therefore, you’ll always be able to go about your hunting duties for as long as you want without worrying about the battery dying. This battery is also powerful enough to sustain the red dot sight at its brightest settings without reducing its performance.


The Holosun 403r turns out to be a professional optical sight given the IP67 waterproof rating, which means that the sight can be submerged into a body of water for up to a meter deep and stay submerged for half an hour without compromising on its functionality features. The above also means that this unit can be used under light rain and precisely acquire a target.

Who is it best suited for?

Are you looking for a high-quality red dot sight but you are working with a tight budget? Well, the Holosun 403R might just be your best bet. This is because it is equipped with features that make it stand out from most of its competitors. You can also easily attach it to your rifle or shotgun and you won’t feel the additional weight as it is one of the lightest red dot sights.

Are there any alternatives to the Holosun 403r?

Yes, there are a number of other red dot sights that can serve as alternatives to the Holsoun 403r. These include the Holosun HS503R, Holosun HS515GM, and the Holosun HE530C-RD Solar Tube Sight

Features of the alternative red dot sights

Holosun HS503R
Holosun HS515GM
Holosun HE530C-RD Solar Tube Sight
Red dot sight
Red dot sight
Red dot sight
2 MOA dot with a 65 MOA circle dot
2 MOA dot with a 65 MOA circle reticle pattern
2 MOA with a 65 MOA dot circle
10 brightness settings and 2 night vision
10 brightness settings and 2 night vision
Works in different lighting conditions
7075 aluminum housing
Machined Titanium housing
Water-resistance level
30 metres submersion
3.53 oz
7 ounces
1.94 pounds
L x W x H (2.75 in x 1.43 in x 1.62in)
5 x 3.8 x 3.6 inches
8.03 x 6.06 x 3.58 inches
Objective lens diameter

Final Verdict: So should you get the Holosun 403r?

Yes, the Holosun 403r is one of the best red dot sights in the market today especially because of its long battery life. Its battery can last you up to 100,000 hours which allows you to use the red dot sight for very long hours without charging it. It is also made of very durable housing which guarantees you long service life.


  1. Is the Holosun 403R red dot sight waterproof?

Yes, this red dot sight has an IP67 rating which means that it is actually waterproof and can be used efficiently underwater.

  1. How many brightness settings does the Holosun 403R red dot sight come with?

It comes with 12 different brightness settings which allow you to have a clear view of your target throughout the day and night.

  1. What is the major difference between the 403r and the 503r?

There isn’t much difference between the two optical sights in terms of features and functionalities, but you will notice some major differences in their reticles.

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Terrence Miller
Terrence Miller is a hunter by birth, picking it up from a lineage of hunters and will probably hand the skill down to his son. He has been hunting since he was a young boy and has knowledge of both the new and old hunting equipment. This goes to say that the information provided is very reliable and conclusive. Using the hunting rifles and getting the right hunting gear seems to be a challenge for many individuals who want to learn the skill of hunting. And the reason why the information presented by Miller has detailed coverage on the different types of rifles, and rifle scopes. When not in the wild hunting, Miller loves horseback riding.


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